Combined Bubble Bar location and adding a bubble into single update.

Combined Bubble Bar location update and adding a new bubble into a
single IPC call update for the Bubble Bar.

Test: atest BubbleDataTest
Test: Manual. Have a shortcut and app icons in the taskbar.
Drag and drop both items over the bubble drop zone.
Observe that items are added to the Bubble Bar.
Bubble Bar location is updated.
Flag: com.android.wm.shell.enable_create_any_bubble
Bug: 388894910

Change-Id: I2493d97baaecc3b7e6c781c2079b51192619aa97